[Gameplay] In-Game Store freeze

I have had this bug before, I thought it was gone in the last patch but it seems to have made a reappearance in 5.1. it always seems to happen in ARAM never in any other game mode. I start a match as usual, and as soon as I open the in-game store the game will freeze and i will be unable to do anything. The server still thinks I am in the game when the game freezes. i've been placed in the low-priority queue again because of this bug.

I am using the Mac client

Thanks